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<p>AgCuTi/porous Cu foam/AgCuTi sandwich composite filler was used as the interlayer to enhance the brazing strength of the Si<sub>3</sub>N<sub>4</sub>/Cu joints. The typical microstructure of the joint brazed with the sandwich composite filler at 880 °C was Si<sub>3</sub>N<sub>4</sub>/TiN/Ti<sub>5</sub>Si<sub>3</sub>+CuTi/Ag(s,s)+Cu(s,s)/Cu, where Cu foam forms an array structure within the joint, creating an interpenetrating network with silver. The thickness of the TiN reaction layer increased from 0.58 to 1.28 µm when the thickness of the porous Cu foam layer increased from 100 to 300 µm. The Si<sub>3</sub>N<sub>4</sub>/Cu joint obtained with 300 µm porous Cu foam owned the highest shear strength of 121.7 MPa, which improved by 281% than that with the use of AgCuTi filler alone. Further, EBSD analysis and finite element simulation revealed that the reduction in residual stress and the increase in plastic deformation effect induced by the Ag(s,s)+Cu(s,s) interpenetrating network structure are the key factors for the enhancement of the mechanical properties of this Si<sub>3</sub>N<sub>4</sub>/Cu joint brazed with AgCuTi/porous Cu foam/AgCuTi sandwich composite filler.</p>

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Microstructure and mechanical strength of the active metal brazed Si3N4/Cu joint with AgCuTi/Cu foam/AgCuTi composite filler

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Ying Wang,
  • Wei Feng,
  • Ruizhi Zhang,
  • Ruxia Liu,
  • Yong Xiao,
  • Guoqiang Luo,
  • Qiang Shen,
  • Jian Zhang

摘要

AgCuTi/porous Cu foam/AgCuTi sandwich composite filler was used as the interlayer to enhance the brazing strength of the Si3N4/Cu joints. The typical microstructure of the joint brazed with the sandwich composite filler at 880 °C was Si3N4/TiN/Ti5Si3+CuTi/Ag(s,s)+Cu(s,s)/Cu, where Cu foam forms an array structure within the joint, creating an interpenetrating network with silver. The thickness of the TiN reaction layer increased from 0.58 to 1.28 µm when the thickness of the porous Cu foam layer increased from 100 to 300 µm. The Si3N4/Cu joint obtained with 300 µm porous Cu foam owned the highest shear strength of 121.7 MPa, which improved by 281% than that with the use of AgCuTi filler alone. Further, EBSD analysis and finite element simulation revealed that the reduction in residual stress and the increase in plastic deformation effect induced by the Ag(s,s)+Cu(s,s) interpenetrating network structure are the key factors for the enhancement of the mechanical properties of this Si3N4/Cu joint brazed with AgCuTi/porous Cu foam/AgCuTi sandwich composite filler.